| 1 |
<?php |
| 2 |
namespace Activitypub; |
| 3 |
|
| 4 |
/** |
| 5 |
* Returns the ActivityPub default JSON-context |
| 6 |
* |
| 7 |
* @return array the activitypub context |
| 8 |
*/ |
| 9 |
function get_context() { |
| 10 |
$context = array( |
| 11 |
'https://www.w3.org/ns/activitystreams', |
| 12 |
'https://w3id.org/security/v1', |
| 13 |
array( |
| 14 |
'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers', |
| 15 |
'PropertyValue' => 'schema:PropertyValue', |
| 16 |
'schema' => 'http://schema.org#', |
| 17 |
'pt' => 'https://joinpeertube.org/ns#', |
| 18 |
'toot' => 'http://joinmastodon.org/ns#', |
| 19 |
'value' => 'schema:value', |
| 20 |
'Hashtag' => 'as:Hashtag', |
| 21 |
'featured' => array( |
| 22 |
'@id' => 'toot:featured', |
| 23 |
'@type' => '@id', |
| 24 |
), |
| 25 |
'featuredTags' => array( |
| 26 |
'@id' => 'toot:featuredTags', |
| 27 |
'@type' => '@id', |
| 28 |
), |
| 29 |
), |
| 30 |
); |
| 31 |
|
| 32 |
return \apply_filters( 'activitypub_json_context', $context ); |
| 33 |
} |
| 34 |
|
| 35 |
function safe_remote_post( $url, $body, $user_id ) { |
| 36 |
$date = \gmdate( 'D, d M Y H:i:s T' ); |
| 37 |
$digest = \Activitypub\Signature::generate_digest( $body ); |
| 38 |
$signature = \Activitypub\Signature::generate_signature( $user_id, 'post', $url, $date, $digest ); |
| 39 |
|
| 40 |
$wp_version = \get_bloginfo( 'version' ); |
| 41 |
$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) ); |
| 42 |
$args = array( |
| 43 |
'timeout' => 100, |
| 44 |
'limit_response_size' => 1048576, |
| 45 |
'redirection' => 3, |
| 46 |
'user-agent' => "$user_agent; ActivityPub", |
| 47 |
'headers' => array( |
| 48 |
'Accept' => 'application/activity+json', |
| 49 |
'Content-Type' => 'application/activity+json', |
| 50 |
'Digest' => "SHA-256=$digest", |
| 51 |
'Signature' => $signature, |
| 52 |
'Date' => $date, |
| 53 |
), |
| 54 |
'body' => $body, |
| 55 |
); |
| 56 |
|
| 57 |
$response = \wp_safe_remote_post( $url, $args ); |
| 58 |
|
| 59 |
\do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id ); |
| 60 |
|
| 61 |
return $response; |
| 62 |
} |
| 63 |
|
| 64 |
function safe_remote_get( $url, $user_id ) { |
| 65 |
$date = \gmdate( 'D, d M Y H:i:s T' ); |
| 66 |
$signature = \Activitypub\Signature::generate_signature( $user_id, 'get', $url, $date ); |
| 67 |
|
| 68 |
$wp_version = \get_bloginfo( 'version' ); |
| 69 |
$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) ); |
| 70 |
$args = array( |
| 71 |
'timeout' => 100, |
| 72 |
'limit_response_size' => 1048576, |
| 73 |
'redirection' => 3, |
| 74 |
'user-agent' => "$user_agent; ActivityPub", |
| 75 |
'headers' => array( |
| 76 |
'Accept' => 'application/activity+json', |
| 77 |
'Content-Type' => 'application/activity+json', |
| 78 |
'Signature' => $signature, |
| 79 |
'Date' => $date, |
| 80 |
), |
| 81 |
); |
| 82 |
|
| 83 |
$response = \wp_safe_remote_get( $url, $args ); |
| 84 |
|
| 85 |
\do_action( 'activitypub_safe_remote_get_response', $response, $url, $user_id ); |
| 86 |
|
| 87 |
return $response; |
| 88 |
} |
| 89 |
|
| 90 |
/** |
| 91 |
* Returns a users WebFinger "resource" |
| 92 |
* |
| 93 |
* @param int $user_id |
| 94 |
* |
| 95 |
* @return string The user-resource |
| 96 |
*/ |
| 97 |
function get_webfinger_resource( $user_id ) { |
| 98 |
return \Activitypub\Webfinger::get_user_resource( $user_id ); |
| 99 |
} |
| 100 |
|
| 101 |
/** |
| 102 |
* [get_metadata_by_actor description] |
| 103 |
* |
| 104 |
* @param string $actor |
| 105 |
* |
| 106 |
* @return array |
| 107 |
*/ |
| 108 |
function get_remote_metadata_by_actor( $actor ) { |
| 109 |
$pre = apply_filters( 'pre_get_remote_metadata_by_actor', false, $actor ); |
| 110 |
if ( $pre ) { |
| 111 |
return $pre; |
| 112 |
} |
| 113 |
if ( preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $actor ) ) { |
| 114 |
$actor = \Acivitypub\Webfinger::resolve( $actor ); |
| 115 |
} |
| 116 |
|
| 117 |
if ( ! $actor ) { |
| 118 |
return null; |
| 119 |
} |
| 120 |
|
| 121 |
$metadata = \get_transient( 'activitypub_' . $actor ); |
| 122 |
|
| 123 |
if ( $metadata ) { |
| 124 |
return $metadata; |
| 125 |
} |
| 126 |
|
| 127 |
if ( ! \wp_http_validate_url( $actor ) ) { |
| 128 |
return new \WP_Error( 'activitypub_no_valid_actor_url', \__( 'The "actor" is no valid URL', 'activitypub' ), $actor ); |
| 129 |
} |
| 130 |
|
| 131 |
$user = \get_users( |
| 132 |
array( |
| 133 |
'number' => 1, |
| 134 |
'who' => 'authors', |
| 135 |
'fields' => 'ID', |
| 136 |
) |
| 137 |
); |
| 138 |
|
| 139 |
// we just need any user to generate a request signature |
| 140 |
$user_id = \reset( $user ); |
| 141 |
|
| 142 |
$response = \Activitypub\safe_remote_get( $actor, $user_id ); |
| 143 |
|
| 144 |
if ( \is_wp_error( $response ) ) { |
| 145 |
return $response; |
| 146 |
} |
| 147 |
|
| 148 |
$metadata = \wp_remote_retrieve_body( $response ); |
| 149 |
$metadata = \json_decode( $metadata, true ); |
| 150 |
|
| 151 |
if ( ! $metadata ) { |
| 152 |
return new \WP_Error( 'activitypub_invalid_json', \__( 'No valid JSON data', 'activitypub' ), $actor ); |
| 153 |
} |
| 154 |
|
| 155 |
\set_transient( 'activitypub_' . $actor, $metadata, WEEK_IN_SECONDS ); |
| 156 |
|
| 157 |
return $metadata; |
| 158 |
} |
| 159 |
|
| 160 |
/** |
| 161 |
* [get_inbox_by_actor description] |
| 162 |
* @param [type] $actor [description] |
| 163 |
* @return [type] [description] |
| 164 |
*/ |
| 165 |
function get_inbox_by_actor( $actor ) { |
| 166 |
$metadata = \Activitypub\get_remote_metadata_by_actor( $actor ); |
| 167 |
|
| 168 |
if ( \is_wp_error( $metadata ) ) { |
| 169 |
return $metadata; |
| 170 |
} |
| 171 |
|
| 172 |
if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) { |
| 173 |
return $metadata['endpoints']['sharedInbox']; |
| 174 |
} |
| 175 |
|
| 176 |
if ( \array_key_exists( 'inbox', $metadata ) ) { |
| 177 |
return $metadata['inbox']; |
| 178 |
} |
| 179 |
|
| 180 |
return new \WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata ); |
| 181 |
} |
| 182 |
|
| 183 |
/** |
| 184 |
* [get_inbox_by_actor description] |
| 185 |
* @param [type] $actor [description] |
| 186 |
* @return [type] [description] |
| 187 |
*/ |
| 188 |
function get_publickey_by_actor( $actor, $key_id ) { |
| 189 |
$metadata = \Activitypub\get_remote_metadata_by_actor( $actor ); |
| 190 |
|
| 191 |
if ( \is_wp_error( $metadata ) ) { |
| 192 |
return $metadata; |
| 193 |
} |
| 194 |
|
| 195 |
if ( |
| 196 |
isset( $metadata['publicKey'] ) && |
| 197 |
isset( $metadata['publicKey']['id'] ) && |
| 198 |
isset( $metadata['publicKey']['owner'] ) && |
| 199 |
isset( $metadata['publicKey']['publicKeyPem'] ) && |
| 200 |
$key_id === $metadata['publicKey']['id'] && |
| 201 |
$actor === $metadata['publicKey']['owner'] |
| 202 |
) { |
| 203 |
return $metadata['publicKey']['publicKeyPem']; |
| 204 |
} |
| 205 |
|
| 206 |
return new \WP_Error( 'activitypub_no_public_key', \__( 'No "Public-Key" found', 'activitypub' ), $metadata ); |
| 207 |
} |
| 208 |
|
| 209 |
function get_follower_inboxes( $user_id ) { |
| 210 |
$followers = \Activitypub\Peer\Followers::get_followers( $user_id ); |
| 211 |
$inboxes = array(); |
| 212 |
|
| 213 |
foreach ( $followers as $follower ) { |
| 214 |
$inbox = \Activitypub\get_inbox_by_actor( $follower ); |
| 215 |
if ( ! $inbox || \is_wp_error( $inbox ) ) { |
| 216 |
continue; |
| 217 |
} |
| 218 |
// init array if empty |
| 219 |
if ( ! isset( $inboxes[ $inbox ] ) ) { |
| 220 |
$inboxes[ $inbox ] = array(); |
| 221 |
} |
| 222 |
$inboxes[ $inbox ][] = $follower; |
| 223 |
} |
| 224 |
|
| 225 |
return $inboxes; |
| 226 |
} |
| 227 |
|
| 228 |
function get_identifier_settings( $user_id ) { |
| 229 |
?> |
| 230 |
<table class="form-table"> |
| 231 |
<tbody> |
| 232 |
<tr> |
| 233 |
<th scope="row"> |
| 234 |
<label><?php \esc_html_e( 'Profile identifier', 'activitypub' ); ?></label> |
| 235 |
</th> |
| 236 |
<td> |
| 237 |
<p><code><?php echo \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ); ?></code> or <code><?php echo \esc_url( \get_author_posts_url( $user_id ) ); ?></code></p> |
| 238 |
<?php // translators: the webfinger resource ?> |
| 239 |
<p class="description"><?php \printf( \esc_html__( 'Try to follow "@%s" by searching for it on Mastodon,Friendica & Co.', 'activitypub' ), \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ) ); ?></p> |
| 240 |
</td> |
| 241 |
</tr> |
| 242 |
</tbody> |
| 243 |
</table> |
| 244 |
<?php |
| 245 |
} |
| 246 |
|
| 247 |
function get_followers( $user_id ) { |
| 248 |
$followers = \Activitypub\Peer\Followers::get_followers( $user_id ); |
| 249 |
|
| 250 |
if ( ! $followers ) { |
| 251 |
return array(); |
| 252 |
} |
| 253 |
|
| 254 |
return $followers; |
| 255 |
} |
| 256 |
|
| 257 |
function count_followers( $user_id ) { |
| 258 |
$followers = \Activitypub\get_followers( $user_id ); |
| 259 |
|
| 260 |
return \count( $followers ); |
| 261 |
} |
| 262 |
|
| 263 |
/** |
| 264 |
* Examine a url and try to determine the author ID it represents. |
| 265 |
* |
| 266 |
* Checks are supposedly from the hosted site blog. |
| 267 |
* |
| 268 |
* @param string $url Permalink to check. |
| 269 |
* |
| 270 |
* @return int User ID, or 0 on failure. |
| 271 |
*/ |
| 272 |
function url_to_authorid( $url ) { |
| 273 |
global $wp_rewrite; |
| 274 |
|
| 275 |
// check if url hase the same host |
| 276 |
if ( \wp_parse_url( \site_url(), \PHP_URL_HOST ) !== \wp_parse_url( $url, \PHP_URL_HOST ) ) { |
| 277 |
return 0; |
| 278 |
} |
| 279 |
|
| 280 |
// first, check to see if there is a 'author=N' to match against |
| 281 |
if ( \preg_match( '/[?&]author=(\d+)/i', $url, $values ) ) { |
| 282 |
$id = \absint( $values[1] ); |
| 283 |
if ( $id ) { |
| 284 |
return $id; |
| 285 |
} |
| 286 |
} |
| 287 |
|
| 288 |
// check to see if we are using rewrite rules |
| 289 |
$rewrite = $wp_rewrite->wp_rewrite_rules(); |
| 290 |
|
| 291 |
// not using rewrite rules, and 'author=N' method failed, so we're out of options |
| 292 |
if ( empty( $rewrite ) ) { |
| 293 |
return 0; |
| 294 |
} |
| 295 |
|
| 296 |
// generate rewrite rule for the author url |
| 297 |
$author_rewrite = $wp_rewrite->get_author_permastruct(); |
| 298 |
$author_regexp = \str_replace( '%author%', '', $author_rewrite ); |
| 299 |
|
| 300 |
// match the rewrite rule with the passed url |
| 301 |
if ( \preg_match( '/https?:\/\/(.+)' . \preg_quote( $author_regexp, '/' ) . '([^\/]+)/i', $url, $match ) ) { |
| 302 |
$user = \get_user_by( 'slug', $match[2] ); |
| 303 |
if ( $user ) { |
| 304 |
return $user->ID; |
| 305 |
} |
| 306 |
} |
| 307 |
|
| 308 |
return 0; |
| 309 |
} |
| 310 |
|
